JP2005262511A - Inkjet recording material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording material, which can be efficiently and easily manufactured by heating and drying, in coating layer of which no crack develops and, at the same time, which has favorable printing grade and external appearance. <P>SOLUTION: In the inkjet recording material having ink accepting layers mainly including ultrafine inorganic particles on a support, either one of the ink accepting layers includes ultrafine inorganic particles and a branched chain polyester amide, which is produced by reacting succinic anhydride and/or phthalic anhydride and diisopropanolamine with each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an ink jet recording material used for a printer or a plotter using an ink jet recording method.

  The ink jet recording method is a method in which fine droplets of ink are ejected by various operating principles and adhered to a recording sheet such as paper to record images / characters. However, high speed, low noise, and multiple colors are achieved. It has features such as easy recording pattern flexibility, no need for development and fixing, and is rapidly spreading in various applications as a recording apparatus for various figures and color images including Chinese characters. Furthermore, images formed by the multi-color ink jet method can obtain recordings that are inferior to those of multi-color printing by the plate making method and printing by the color photographic method. Since it is cheaper than photographic technology, it has been widely applied to the field of full-color image recording.

  Recently, inkjet printers and the like that can output high-definition images comparable to images of silver salt photographs are commercially available at low cost. Inkjet recording sheets are very cheap compared to the silver halide photography method, but they are very cheap, so it is economical for users who frequently change their display images for advertisements or product samples that require large-area images. There are significant advantages. Also, it has been impossible to create an image on a personal computer, which has become popular recently, and correct the color scheme and layout while looking at the printout. There is also an advantage that such an operation can be easily performed. Against this background, there is an increasing demand for ink jet recording materials.

  As these ink jet recording materials, for the purpose of obtaining a high surface gloss ink jet recording material or a transparent ink jet recording material, etc., an ink jet recording material containing inorganic ultrafine particles has been proposed, and the primary particle diameter is mainly 3 nm to 30 nm. An ink jet recording material using synthetic silica by a phase method is disclosed (for example, see Patent Documents 1 and 2).

  In addition, for the purpose of obtaining particularly good ink fixability and surface gloss, ink jet recording materials containing alumina as inorganic ultrafine particles have been proposed (see, for example, Patent Documents 3 to 5).

  When the ink receiving layer containing such inorganic ultrafine particles is formed by a method of applying and drying the coating liquid of the ink receiving layer, the coating layer has a characteristic that it shrinks very much when dried. Cracks are likely to occur, resulting in a decrease in surface gloss, deterioration in appearance, and uneven absorption of ink. Such cracks tend to occur more frequently as the coating layer is thicker and the drying speed is faster. In order to obtain sufficient ink absorptivity with an ink receiving layer containing inorganic ultrafine particles as a main component, the ink receiving layer needs to have a certain thickness or more, and is coated and dried to such an ink receiving layer thickness. In particular, there is a problem that cracks tend to occur.

As a method for preventing cracks due to drying shrinkage, there are a method using gelatin as a binder, and a method of containing boric acid or a salt of boric acid using polyvinyl alcohol as a binder. For example, gelatin aqueous solution is generally in an aqueous solution state at about 30 ° C. or higher, but has a property of gelling at 20 to 25 ° C. or lower. Similarly, a polyvinyl alcohol aqueous solution containing boric acid or borate gels by cooling. Utilizing this property, after applying a water-based coating liquid containing these on a support, cooling and gelling, and then drying at a relatively low temperature (about 20 to 60 ° C.), cracks are generated. A coating layer having a high film thickness can be obtained. However, when manufactured by such a method, there is a problem that the manufacturing efficiency is low compared to the case where the coating layer is heated and dried using hot air or infrared rays of 100 ° C. or higher, and improvement is desired (for example, And Patent Document 6).
JP-A-10-203006 (page 3-9) JP-A-8-174992 (page 3-6) JP-A-5-50739 (page 2-4) JP-A-6-55829 (page 2-3) JP-A-8-207431 (page 2-5) JP-A-7-76161 (page 2-3)

  An object of the present invention is to provide an ink jet recording material having an ink receiving layer containing inorganic ultrafine particles as a main component on a support, which can be efficiently and easily produced by heating and drying, and the coating layer has cracks. It is an object to provide an ink jet recording material having no print quality and good appearance.

  As a result of diligent research to achieve the above object, in an ink jet recording material in which one or more ink receiving layers are provided on a support, any one of the ink receiving layers has inorganic ultrafine particles and branching. The invention has been solved by an ink jet recording material comprising a chain polyesteramide, wherein the branched polyesteramide is obtained by reacting succinic anhydride and / or phthalic anhydride with diisopropanolamine.

  The inorganic ultrafine particles are more preferably alumina hydrate.

  More preferably, the ink receiving layer containing alumina hydrate and branched polyesteramide contains phosphoric acid.

  According to the present invention, it is possible to efficiently produce an ink jet recording material having excellent print quality and appearance by suppressing cracks in the coating layer of the ink receiving layer containing inorganic ultrafine particles.

  The ink jet recording material of the present invention will be described below.

The ink jet recording material of the present invention is obtained by reacting succinic anhydride and / or phthalic anhydride with diisopropanolamine, among the ink receiving layers constituting the ink jet recording material, the ink receiving layer containing inorganic ultrafine particles. By containing a branched polyester amide, coating is performed with an increased coating amount of the ink-receiving layer, and a coating layer in which cracks are suppressed even when drying is performed by heating such as blowing hot air is obtained. I can do it. The range in which a coating layer with suppressed cracking can be obtained is 40 g / m ² or less in terms of dry coating amount.

  The branched polyesteramide used in the present invention is disclosed in JP-T-2001-518539, and is obtained by reacting succinic anhydride and / or phthalic anhydride with diisopropanolamine. The branched polyester amide is available from DMSM of the Netherlands. buoy. It is marketed by the company under the product name Hybrane and can be used. The hydrophilicity of the branched polyester amide varies depending on the ratio of succinic anhydride and phthalic anhydride used in the synthesis of the branched polyester amide. When the ratio of succinic anhydride is large, the hydrophilicity is high, and when it is low, the hydrophilicity is low. The branched polyesteramide used in the present invention is more preferable as the hydrophilicity is higher, and the ratio of succinic anhydride to the sum of succinic anhydride and phthalic anhydride is particularly preferably 80 mol% or more.

  The ratio of the branched polyesteramide to the ultrafine inorganic particles is preferably 2 to 15% by mass. When the ratio of the branched polyester amide is smaller than this range, a sufficient crack preventing effect cannot be obtained. Further, if the ratio of the branched polyester amide is larger than this range, the ink absorbability may be insufficient.

  The inorganic ultrafine particles in the ink jet recording material of the present invention refer to inorganic fine particles having a primary particle diameter of 100 nm or less and a secondary particle diameter of 500 nm or less, for example, JP-A-1-97678 and JP-A-2-275510. Pseudoboehmite disclosed in JP-A-3-281383, JP-A-3-285814, JP-A-3-285815, JP-A-4-92183, JP-A-4267180, and JP-A-4-275717. Alumina hydrates such as sol, vapor phase alumina described in JP-A-8-72387, JP-A-60-219083, JP-A-69-1389, JP-A-61-188183, JP-A-63 Colloidal silica as described in JP-A-178074, JP-A-5-51470, and the like; And silica / alumina hybrid sols as described in JP-A-62-2286787, gas phase methods as described in JP-A-10-119423 and JP-A-10-217601 Silica sol in which silica is dispersed, silica sol obtained by pulverizing wet silica such as precipitated silica or gel method silica, and other smectite clays such as hectite and montmorillonite (JP-A-7-81210), zirconia sol, chromia sol, yttria Typical examples include sol, ceria sol, iron oxide sol, zircon sol, aluminum oxide sol, and antimony oxide sol.

  Among the above-mentioned inorganic ultrafine particles, alumina hydrate is particularly preferable. When alumina hydrate is used, cracks are less likely to occur on the surface of the coating layer, and higher surface gloss and higher printing density can be obtained.

The alumina hydrate used in the present invention can be represented by the following general formula. Al ₂ O ₃ · nH ₂ O alumina hydrates are classified into gypsite, vialite, norstrandite, boehmite, boehmite gel (pseudoboehmite), diaspore, amorphous amorphous, etc., depending on the composition and crystal form. The In particular, in the above formula, when the value of n is 1, it represents an alumina hydrate having a boehmite structure, and when n is more than 1 and less than 3, it represents an alumina hydrate having a pseudo boehmite structure, where n is 3 or more represents an amorphous alumina hydrate. In particular, the preferred alumina hydrate for the present invention is an alumina hydrate having a pseudo boehmite structure in which at least n is more than 1 and less than 3.

  The shape of the alumina hydrate used in the present invention may be any of a flat plate shape, a fiber shape, a needle shape, a spherical shape, a rod shape, and the like, and a preferable shape is a flat shape from the viewpoint of ink absorbability. The plate-like alumina hydrate has an average aspect ratio of 3 to 8, and preferably an average aspect ratio of 3 to 6. The aspect ratio is expressed as the ratio of the “diameter” to the “thickness” of the particles. Here, the diameter of the particle represents the diameter of a circle equal to the projected area of the particle when the alumina hydrate is observed with an electron microscope.

  The alumina hydrate used in the present invention can be produced by a known method such as hydrolysis of aluminum alkoxide such as aluminum isopropoxide, neutralization of aluminum salt with alkali, hydrolysis of aluminate. The physical properties of alumina hydrate, such as particle size, pore size, pore volume, and specific surface area, should be controlled by conditions such as precipitation temperature, aging temperature, aging time, solution pH, solution concentration, and coexisting compounds. Can do.

  As a method for obtaining alumina hydrate from alkoxide, JP-A-57-88074, JP-A-62-56321, JP-A-4-275717, JP-A-6-64918, JP-A-7-10535, JP-A-7-267633, U.S. Pat. No. 2,656,321 and the like disclose methods for hydrolyzing aluminum alkoxide. These aluminum alkoxides include isopropoxide, 2-butoxide and the like.

  The alumina hydrate used in the present invention is preferably an alumina hydrate having an average primary particle size of 3 nm to 25 nm. A particularly preferable average primary particle diameter is 5 nm to 20 nm. Further, the secondary particle diameter in which these are aggregated is preferably 50 nm to 200 nm.

  In the case where alumina hydrate is used for the inorganic ultrafine particles, it is preferable that phosphoric acid is contained in the ink receiving layer containing the inorganic ultrafine particles because cracks in the coating layer are further hardly generated. The ratio of phosphoric acid to alumina hydrate is preferably 0.5 to 5% by mass. If the ratio of phosphoric acid is smaller than this range, a sufficient effect cannot be obtained. On the other hand, if the ratio of phosphoric acid is larger than this range, the fluidity of the coating solution is deteriorated and the suitability for coating may be impaired.

  The proportion of the inorganic ultrafine particles contained in the ink receiving layer containing the inorganic ultrafine particles and the branched polyesteramide according to the present invention is preferably 50% by mass or more, and 70% by mass or more based on the total solid content of the ink receiving layer. Particularly preferred. If the proportion of the inorganic ultrafine particles is less than 50% by mass, sufficient ink absorbability cannot be obtained.

  In the ink receiving layer containing the inorganic ultrafine particles and the branched polyesteramide according to the present invention, a hydrophilic binder that maintains the properties as a film and has high transparency and high ink permeability is used. Examples of the hydrophilic binder include starch derivatives such as oxidized starch, etherified starch, and phosphate esterified starch; cellulose derivatives such as methylcellulose, carboxymethylcellulose, and hydroxyethylcellulose; polyvinyl alcohol derivatives such as polyvinyl alcohol and silanol-modified polyvinyl alcohol Casein, gelatin and modified products thereof, soy protein, pullulan, gum arabic, Karaya gum, albumin and other natural polymer resins or derivatives thereof, vinyl polymers such as polyacrylamide and polyvinylpyrrolidone, alginic acid, polyethyleneimine, polypropylene glycol, Examples thereof include polyethylene glycol, maleic anhydride or a copolymer thereof, and these can be used alone or in combination. The present invention is not limited to, et al. Polyvinyl alcohol derivatives such as polyvinyl alcohol or silanol-modified polyvinyl alcohol are preferred from the viewpoints of adhesive strength, film formability, and the like. Among the polyvinyl alcohols, polyvinyl alcohol having a saponification degree of 80% or more, more preferably 88% or more and less than 99%, is particularly preferable among polyvinyl alcohols in terms of adjustment of the coating liquid viscosity and film formability. Of polyvinyl alcohol. The average degree of polymerization is preferably 1000 or more, particularly preferably 2000 or more.

  The binder content in the ink receiving layer containing the inorganic ultrafine particles and branched polyesteramide according to the present invention is 100 parts by mass of the inorganic ultrafine particles in terms of coating layer strength, coating layer cracking, and ink absorbability. It is 2-30 mass parts with respect to this, Preferably, it is 4-25 mass parts.

The dry coating amount of the ink receiving layer containing the inorganic ultrafine particles and branched polyesteramide according to the present invention is not particularly limited, but is preferably 3 to 40 g / m ² , more preferably 5 to 30 g / m. m ² .

In the ink jet recording material of the present invention, one or more other ink receiving layers may be provided between the ink receiving layer containing the inorganic ultrafine particles and the branched polyesteramide and the support. Further, one or more other ink receiving layers may be provided on the ink receiving layer containing the inorganic ultrafine particles and the branched polyesteramide.

  The ink receiving layer according to the present invention is formed by applying and drying a coating liquid containing the components of the ink receiving layer. It does not specifically limit as a method of apply | coating a coating liquid on a support body. Specific examples of the coating method include a method of using various devices such as various blade coaters, roll coaters, air knife coaters, bar coaters, rod blade coaters, curtain coaters, short dwell coaters, and size presses on-machine or off-machine. Can do.

  The ink receiving layer coating liquid applied to the support is subsequently dried. The drying method is not particularly limited, but a method of heating and drying by a method of blowing hot air, a method of irradiating infrared rays, or the like is preferably used because of high productivity.

  In the ink-receiving layer coating liquid of the ink jet recording material of the present invention, as additives, dye fixing agent, pigment dispersant, thickener, fluidity improver, antifoaming agent, antifoaming agent, release agent, foaming Additives such as additives, penetrants, coloring dyes, coloring pigments, fluorescent brighteners, UV absorbers, antioxidants, antiseptics, antibacterial agents, water resistance agents, wet paper strength enhancers, and dry paper strength enhancers. I can do it.

  In particular, secondary amines, tertiary amines that form insoluble salts with sulfonic acid groups, carboxyl groups, amino groups, etc. in water-soluble direct dyes and water-soluble acidic dyes that are dye components of water-based inks used in inkjet printers, When a cationic dye fixing agent composed of a quaternary ammonium salt is added, the dye is trapped in the ink receiving layer, so that the ink flows out and bleeds by dripping water or absorbing moisture due to the improvement of color and the formation of insoluble salts. This is preferable because it suppresses the ejection.

  The support used in the inkjet recording material of the present invention may be any of transparent, translucent and opaque. Paper, various nonwoven fabrics, woven fabric, synthetic resin film, synthetic resin laminated paper, synthetic paper, metal foil, ceramic paper A glass sheet or a composite sheet obtained by combining these can be arbitrarily used depending on the purpose, but is not limited thereto.

  As the paper used as the support, chemical pulp such as LBKP and NBKP, wood pulp such as GP, PGW, RMP, mechanical pulp such as TMP, CTMP, CMP, and CGP, waste paper pulp such as DIP, and conventionally known pigments are mainly used. As a component, a binder, a sizing agent, a fixing agent, a yield improver, a cationizing agent, a paper strength enhancer and the like are mixed using one or more additives, and a long net paper machine, a circular net paper machine, a twin wire paper machine. Base paper manufactured by various devices such as a machine, base paper provided with size press or anchor coat layer with starch, polyvinyl alcohol, etc., or art paper, coated paper, cast with a coat layer on them Coated paper such as coated paper is also included. Such base paper and coated paper may be provided with the coating layer in the present invention as they are, or a calendar device such as a machine calendar, a TG calendar, and a soft calendar may be used for the purpose of controlling flattening.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples. In the examples, “parts” and “%” indicate parts by mass and mass% unless otherwise specified.

"Production of gas phase silica dispersion"
4 parts of 50% dimethyldiallylammonium chloride homopolymer (molecular weight 9000) and 100 parts of gas phase method silica (average primary particle size 12 nm, specific surface area 200 m ² / g by BET method) are added to 396 parts of ion-exchanged water, and sawed A preliminary dispersion was prepared using a toothed blade type disperser. The obtained preliminary dispersion was treated with a high-pressure homogenizer to obtain a 20% gas phase silica dispersion.

“Preparation of Alumina Hydrate Dispersion”
1200 parts of ion exchange water and 900 parts of isopropyl alcohol were charged into a reactor and heated to 75 ° C. 408 parts of aluminum isopropoxide was added, and hydrolysis was performed at 75 ° C. for 24 hours and at 95 ° C. for 4 hours. Thereafter, 24 parts of acetic acid was added, and the mixture was stirred at 95 ° C. for 40 hours, concentrated to a solid content of 20%, adjusted to pH 3.0 by adding acetic acid, and dispersed in alumina hydrate. A liquid was obtained.

  When this sol was dried at room temperature and measured for X-ray diffraction, it showed a pseudo-boehmite structure. Further, when the average particle diameter was measured with a transmission electron microscope, it was about 20 nm and was an alumina hydrate having a flat pseudoboehmite structure with an aspect ratio of 5.

"Coating liquid 1"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 1” having a solid content concentration of 17.5%. In addition, the raw material acid anhydride of the branched polyesteramide (HBM-S1 made by DSM NV) used for this coating liquid is only succinic anhydride.
-72.7 parts of the above-mentioned gas phase method silica dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
21.8 parts-50% branched-chain polyesteramide aqueous solution (HMB-S1 manufactured by DSM NV) 1.5 parts-Water 4.0 parts

"Coating liquid 2"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 2” having a solid content concentration of 17.5%. The raw acid anhydride of the branched polyester amide (Hybrane-P1 manufactured by DSM NV) used in this coating solution is 80 mol% succinic anhydride and 20 mol% phthalic anhydride.
-72.7 parts of the above-mentioned gas phase method silica dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
21.8 parts-50% branched polyesteramide aqueous solution (HBM -P1 manufactured by DSM NV) 1.5 parts-Water 4.0 parts

"Coating liquid 3"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 3” having a solid content concentration of 17.5%. The raw acid anhydride of the branched polyester amide (Hybrane-P4 manufactured by DSM NV) used in this coating solution is 60 mol% succinic anhydride and 40 mol% phthalic anhydride.
-72.7 parts of the above-mentioned gas phase method silica dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
21.8 parts ・ 50% branched polyesteramide aqueous solution (HBM-P4 manufactured by DSM NV) 1.5 parts ・ Water 4.0 parts

"Coating fluid 4"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 4” having a solid concentration of 16%.
-72.7 parts of the above-mentioned alumina hydrate dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
7.3 parts-50% branched-chain polyesteramide aqueous solution (HMB-S1 manufactured by DSM NV) 1.5 parts-Water 18.5 parts

"Coating fluid 5"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 5” having a solid concentration of 16%.
-72.7 parts of the above-mentioned alumina hydrate dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
7.3 parts-50% branched-chain polyesteramide aqueous solution (HMB-P1 manufactured by DM NV) 1.5 parts-Water 18.5 parts

"Liquid 6"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 6” having a solid concentration of 16%.
-72.7 parts of the above-mentioned alumina hydrate dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
7.3 parts-50% branched-chain polyesteramide aqueous solution (DBM NV, Hybrane-P4) 1.5 parts-Water 18.5 parts

“Coating fluid 7”
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 7” having a solid content concentration of 17.0%.
-72.7 parts of the above-mentioned gas phase method silica dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
21.8 parts-50% branched-chain polyesteramide aqueous solution (Hybrane-S1 made by DSM NV) 0.6 parts-Water 4.9 parts

“Coating fluid 8”
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 8” having a solid content concentration of 18.9%.
-72.7 parts of the above-mentioned gas phase method silica dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
21.8 parts-50% branched-chain polyesteramide aqueous solution (Hybrane-S1 manufactured by DMV.) 4.4 parts-Water 1.1 parts

"Coating fluid 9"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 9” having a solid concentration of 15.6%.
-72.7 parts of the above-mentioned alumina hydrate dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
7.3 parts-50% branched-chain polyesteramide aqueous solution (HBM-S1 manufactured by DM NV) 0.6 parts-Water 19.4 parts

“Coating fluid 10”
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 10” having a solid content concentration of 17.5%.
-72.7 parts of the above-mentioned alumina hydrate dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
7.3 parts ・ 50% branched polyesteramide aqueous solution (Hybrane-S1 manufactured by DMNV.) 4.4 parts ・ Water 15.6 parts

"Coating fluid 11"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 11” having a solid concentration of 17.7%.
-72.7 parts of the above-mentioned gas phase method silica dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
21.8 parts-50% branched-chain polyesteramide aqueous solution (DBM NV, Hybrane-S1) 1.5 parts-Phosphoric acid (concentration 85%) 0.34 parts-Water 3.7 parts

“Coating fluid 12”
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 12” having a solid content of 16.3%.
-72.7 parts of the above-mentioned alumina hydrate dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
7.3 parts ・ 50% branched-chain polyesteramide aqueous solution (DBM NV, Hybrane-S1) 1.5 parts ・ Phosphoric acid (concentration 85%) 0.34 parts ・ Water 18.2 parts

"Coating fluid 13"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 13” having a solid concentration of 16.7%.
-72.7 parts of the above-mentioned gas phase method silica dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
21.8 parts ・ Water 5.5 parts

“Coating fluid 14”
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 14” having a solid concentration of 15.3%.
-72.7 parts of the above-mentioned alumina hydrate dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
7.3 parts ・ Water 20.0 parts

"Coating fluid 15"
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 15” having a solid concentration of 16.9%.
-72.7 parts of the above-mentioned gas phase method silica dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
21.8 parts ・ Boric acid 0.15 parts ・ Water 5.3 parts

“Coating fluid 16”
A liquid mixture having the following composition was stirred with a homomixer to prepare “Coating liquid 16” having a solid concentration of 15.4%.
-72.7 parts of the above-mentioned alumina hydrate dispersion-10% polyvinyl alcohol aqueous solution (saponification degree 98%, polymerization degree 1700)
7.3 parts ・ Boric acid 0.15 parts ・ Water 19.9 parts

On a transparent polyethylene terephthalate film having a thickness of 100 μm, “Coating liquid 1” was applied using a Mayer bar so that the wet coating amount was 200 g / m ^{2, and} was dried by blowing air at 150 ° C. to perform ink jet recording. The material was made.

  An ink jet recording material was prepared under the same conditions as in Example 1 except that “Coating liquid 2” was used instead of “Coating liquid 1” in Example 1.

  An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating Liquid 3” was used instead of “Coating Liquid 1” in Example 1.

  An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating Liquid 4” was used instead of “Coating Liquid 1” in Example 1.

  An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating liquid 5” was used instead of “Coating liquid 1” in Example 1.

  An ink jet recording material was prepared under the same conditions as in Example 1 except that “Coating liquid 6” was used instead of “Coating liquid 1” in Example 1.

  An inkjet recording material was produced under the same conditions as in Example 1 except that “Coating Liquid 7” was used instead of “Coating Liquid 1” in Example 1.

  An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating liquid 8” was used instead of “Coating liquid 1” in Example 1.

  An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating liquid 9” was used instead of “Coating liquid 1” in Example 1.

  An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating Liquid 10” was used instead of “Coating Liquid 1” in Example 1.

  An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating Liquid 11” was used instead of “Coating Liquid 1” in Example 1.

  An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating liquid 12” was used instead of “Coating liquid 1” in Example 1.

(Comparative Example 1)
An ink jet recording material was prepared under the same conditions as in Example 1 except that “Coating liquid 13” was used instead of “Coating liquid 1” in Example 1.

(Comparative Example 2)
An ink jet recording material was prepared under the same conditions as in Example 1 except that “Coating liquid 14” was used instead of “Coating liquid 1” in Example 1.

(Comparative Example 3)
An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating liquid 15” was used instead of “Coating liquid 1” in Example 1.

(Comparative Example 4)
An ink jet recording material was produced under the same conditions as in Example 1 except that “Coating liquid 16” was used instead of “Coating liquid 1” in Example 1.

Evaluation Images were printed on the inkjet recording materials produced in Examples 1 to 12 and Comparative Examples 1 to 4 using “HP Deskjet 5550 (printer setting: Blosser & Flyer paper (double-sided glossy paper)” manufactured by Hewlett-Packard Japan, Ltd. The prints were evaluated for cracks in the coating layer, transparency, surface glossiness, and print quality.The images used for the evaluation were solid prints of black, cyan, magenta, yellow, blue, red, and green colors and their prints. It consists of a pattern with white letters inside.

  As for the state of cracks in the coating layer, the surface of the produced inkjet recording material was visually observed to evaluate the length and frequency of the cracks, and the results are shown in “Crack of coating layer” in Table 1.

  Transparency was evaluated by visually observing the surface of the produced inkjet recording material and represented by a numerical value of 1-10. 1 indicates the lowest transparency, the higher the numerical value, the higher the transparency, and 10 indicates the highest transparency. The results are shown in “Transparency” in Table 1.

  For the surface gloss, the 20-degree specular gloss was measured by the method for measuring the specular gloss specified in JIS standard Z8741. The results are shown in “Surface Gloss” in Table 1.

  The print quality was evaluated by visually observing the uniformity of a solid print portion, the boundary between adjacent solid print portions, the sharpness of white characters, and the like, and was represented by a numerical value of 1 to 10. 1 indicates the worst printing quality, and the higher the numerical value, the better. 10 indicates the best. The results are shown in “Print quality” in Table 1.

  In Table 1, as shown in Examples 1 to 12, by containing a branched polyesteramide in the ink receiving layer containing inorganic ultrafine particles, cracks in the ink receiving layer caused by heat drying can be suppressed. Surface gloss and transparency were high, and better print quality could be obtained.

  In Examples 4 to 6, 9, 10, and 12 in which the inorganic ultrafine particles were alumina hydrate, cracks in the coating layer were less likely to occur, a high surface gloss was obtained, and printing quality was also good. Furthermore, in Example 12 containing phosphoric acid, it was possible to completely prevent cracks, particularly high surface gloss and transparency, and good print quality was obtained.

  In Comparative Examples 1 to 4 not containing a branched polyesteramide, large cracks frequently occurred, the surface gloss and transparency were low, and the printing quality was poor.

Claims (3)

  In the ink jet recording material in which one or more ink receiving layers are provided on a support, any one of the ink receiving layers contains inorganic ultrafine particles and a branched polyester amide, and the branched polyester An ink jet recording material, wherein the amide is obtained by reacting succinic anhydride and / or phthalic anhydride with diisopropanolamine.   2. The ink jet recording material according to claim 1, wherein the inorganic ultrafine particles are alumina hydrate.   The ink jet recording material according to claim 2, wherein the ink receiving layer containing inorganic ultrafine particles and branched polyesteramide contains phosphoric acid.